Former Denver Broncos wide receiver Demaryius Thomas has died at age 33, according to police.

Roswell, Georgia, police said Thursday night that Thomas was found dead in his home. Preliminary reports indicate Thomas may have died from a medical issue.

LaTonya Bonseigneur, a first cousin who grew up with Thomas, so close they considered themselves siblings, told The Associated Press that the family believes he died from a seizure.

"He had been suffering from seizures for over a year, and we believe he had a seizure when he was showering," Bonseigneur said. "We're not sure when he died. We just spoke with him yesterday."

Thomas had 724 catches, 9,763 yards and 63 touchdowns in his career.